ALEXANDRIA, Va., June 19 -- United States Patent no. 12,331,776, issued on June 17, was assigned to Yong-Keun Kim (Incheon, South Korea).

"Parallel-tapered-integrated screw-coupling structure for connecting reinforcing bars" was invented by Yong-Keun Kim (Incheon, South Korea) and Tae-Kyung Kim (Incheon, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "In a screw-coupling structure between an internally-threaded body and an externally-threaded body, for connecting reinforcing bars: the internally-threaded body includes, on the inner diameter thereof, a parallel-tapered-integrated internal thread section formed by integrating a parallel internal thread section formed as a parallel screw thread, with...